Safety suspending device for lift-cages.



SAFETY SUSPENDING DEVICE FOR LIFT GAGES.

APPLICATION FILED AUG. 28, 1911.

1,010,281, Patented 11011.28, 1911.

Jnvenfor:

COLUMBIA PLANOGRAPH 120-,WASHINGTON. D. c.

EPIC.

FRANZ LOOS, OF OTTOWITZ, NEAR CARLSBAID, AUSTRIA-HUNGARY, ASSIGNOR IO CAMILL SCHWALB, OF CARLSBAD, AUSTRIA-HUNGARY.

SAFETY SUSPENDING DEVICE FOR LIFT-CAGES.

Specification of Letters Patent.

Patented Nov. 28, 1911.

To all whom'tt may concern:

Be it known that I, FRANZ Loos, a subject of the Emperor of 'AustriaHungary, and resident of Ottowitz, near Carlsbad, Bohemia, Austria-Hungary, have invented certain Improvements in Safety Suspepding Devices for Lift-Cages, of which the following is a specification.

It is known to arrange the cage of a lift in a frame work in which it can be vertically displaced, said frame work, which is normally supported on the cage and guides the latter on the guide-beams, being provided above and below the cage with catches adapted, in case the hoisting cable breaks, to successively grip the guide-beams and retain the cage on the latter.

The present invention relates to a device of this kind and consists in the construction and arrangement, as hereinafter described and claimed, of the means whereby the catches are operated, the object of the invention being to insure a gradual stopping of the cage and so to obviate shocks.

In the accompanying drawings the invention is illustrated, Figure 1 representing a front View, and Fig. 2, a side view of the improved arrangement.

' The cage 6 is fitted and guided in known manner in a frame work a so as to admit of vertical adjustment in the same. The hoisting cable is connected by means of a hooked or eyed arm 0 to the cage 7). Above the cage 5 two shafts cl are provided which are rotatably held in the frame work a so as to have their ends disposed at opposite sides of the beams on which the lift is guided by means of the frame. Catches in the form of cams e are provided on the ends of the shafts which catches are adapted, in one position, to grip the beams so as to hold the frame and cage suspended on the latter. Normally the frame work is supported on the cage, and the cams e are held out of engagement with the guide-beams by means of curved arms f mounted on the shafts d and resting on some element of the cage, for instance the top cover. Springs 9 abut against the arms f and tend to turn them so as to apply the cams e to the guide-beams. Underneath the cage, shafts h and cams i are mounted in the frame work in a similar manner, the curved controlling arms 70 being here directed upward and guided loosely in eyes Z connected to the cage.

The modus operandi is as follows: If the hoisting cable should break, the frame work a, owing .to its engagement with the guidebeams, will be slower than the cage Z) in descending. The relative movement of the cage and frame work reacts upon the arms f and is so as to turn the cams into engagement with the guide-beams and fix the frame work with the cage thereon. The arrangement is such that the cams e are first applied to the beams so as to retard the movement, the braking effect being then gradually increased, until the movement is stopped, by the application to the beams of the cams '5. Finally the arms f are set perfectly free so that, actuated by the springs 9, they can apply the cams 6 completely to the beams for fixing the frame and the cage to the latter. In this manner the stopping of the lift is effected entirely without shocks. When, after the hoisting cable has been re paired or renewed, the cage is lifted, a displacement of the same takes place in the reverse direction. This causes first a release of the cams z from the guide-beams, the arms f being next engaged by the cage and turned, in opposition to the springs g, so as to release the cams e as well. A gradual and jerkless loosening of the lift is thus effected.

I claim:

In a safety suspending device for lift cages of the character described, the combination with a frame work which is normally supported on the cage and which guides the latter on the guide-beams, the cage admitting of vertical displacement in the frame, of shafts mounted in the frame above and below the cage so as to have their ends disposed at opposite sides of the guide-beams, cams fitted on the ends of the shafts so as to admit of being applied to the beams when the shafts are turned, curved arms on theupper shafts normally supported on the cage so as to hold the cams in inoperative position, springs acting on said arms and tending to turn the cams into operative position, and curved arms on the lower shafts loosely guided in eyes on the cage so as to hold the cams of said shafts normally in inoperative position, the arrangements being such that first applied to the beams and then the When the cage is displaced in the frame OW- lower ones, substantially as and for the puring to the breaking of the hoisting cable, pose set forth.

the upper arms are turned by the springs FRANZ LOOS. and the lower arms by the cage for apply- Witnesses:

ing the cams to the guide-beams and fixing ROBERT C. BoEsEL,

the lift to the latter, the upper cams being OSKAR GOLDMANN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

